Mold for pressed glassware and pottery-ware.



No. 636,795. Patented Nov. I4, |899. A. R. GRUTZ.

MOLD FOR PRESSED GLASSWARE AND PUTTERY WARE.

( 1' ses.)

xcatxon filed June 8, 1

2 Sheets-Sheet L ,96 ,ullml/un 27 7 l?" .5 Hummm a3 IHW" g Nul mmlllllbgl Q yg U NN f No. 636,795. Patented Nov. I4, |899.

A. R. GRUTZ.

MOLD FDR PRESSED GLASSWARE AND PUTTERY WARE.

(Application led June 8, 1899.) (No Modgl.; 1: ,.z

2 Sheets-Sheet 2,

gum@

@mill- NITED STATES A'rnNT OFFICE.

MOLD FOR PRESSED GLASSWARE AND POTTERY-WARE.

SPECIFICATION formingpart of Letters Patent No. 636,795, dated November14, 1899. Application led June 8, 1899. Serial No. '7191795- (No model.)

T0 a/ZZ whom, it may concern:

Be it known that l, ALBERT R. GROTZ, a citizen of the United States,residing at Lazearville, in the county of Brooke and Stale of WestVirginia, have invented certain new and useful Improvements in Molds forPressed Glassware and Pottery-Ware; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to molds for pressed glassware, pottery-ware, orplastic compositions, either of the open-and-shut type or the blockVariety, according to the grade or quality of the articles to be moldedand whether the articles are to be seamless or not.

The primary object of the invention is the provision of a mold whichwill enable two or more articles being pressed at the same time, theplungers being so mounted as to yield and equalize the pressure andinsure perfect work even though the material is a little over or atrifle short of the required amount. Without this provisionv imperfectwork would result, as it is practically impossible to supply thecavities of the mold with the exact quantity of material each time, andthe article pressed from the material short of the required amount wouldbe incomplete if the plungers were rigidly connected; but by having theplungers loosely connected they can adapt themselves to variations inthe quantity of material in each cavity of the mold and distribute thepressure equally upon each.

The improvement consists, essentially, of the novel features, details ofconstruction, and combinations of parts,which will be more particularlyoutlined in the appended claims.

The invention is applicable to different forms of molds for glassware,pottery-ware, and plastic compositions, and in the practical embodimentthereof it is to be understood that various changes in the form,proportions, and minor details of construction may be resorted towithout departing from the spirit or sacrificing any of the Vadvantagesof the invention.

In the drawings forming a part of this specification, Figure l isa topplan View of a mold constructed in accordance with the invention, thepressing mechanism being omitted. Fig.

2 is a longitudinal section showing the relation of the parts when theplungers have been forced into the mold-cavities to shape the materialplaced therein. Fig. 3 is a plan section. Fig. is adetail view of thebase. Fig. 5 is a detail view in perspective of a side section of theopen-and-shutl mold. Fig. 6 is an end view of the pressing mechanism.Fig. 7 is a detail view of a block mold, the parts being separated anddisposed in a group.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The mold proper comprises a base l, a sectional body composed of endpieces 2 and side pieces 3, and a combined cap and guide plate 4, thelatter being removably fitted to the body of lthe mold after thesections thereof have been brought into proper relation. The base isprovided upon its top side with bosses or projections 5 and 6, which arepreferably of circular outline and have their edges undercut so as tointerlock positively with the sections of the mold-body and hold thelatter and base in proper position when forming the articles by theapplication of force to expanding plungers. The c'om ponent parts of themoldbody are formed in their lower faces with depressions 7, whichunitedly forni a seat to receive the respective bosses or projections 5and 6. The bosses may serve as a portion of the molding-surface of thecavity in which the material is shaped and formed under pressure. Thisis plainly shown at the right-hand side of Fig. 2, in which the top sideof the boss is illustrated as constituting the bottom of themold-cavity.

The mold sections or parts are hollow, the spaces opening through thebottom sides of the sections and being closed by means of the base-platel. Openings 8 are formed in the end walls of the mold-sections incoincident relation, whereby the spaces or chambers intercommunicat-e,so as to establish and maintain a circulation of hot air or flamethrough the entire body of the mold when the latter is in activeoperation, thereby preventing chilling of the glass or other material tobe shaped. The mold-sections are connected by hingejoints in the usualway and are united by miter-j oints, whereby the sections are enabledVto readily open and close. Handles 9 and 10 are applied to adjacentsections of the moldbody and are grasped when it is required to open orclose the mold. The separable or parting sections' are connected andforcibly brought together by means of a pin 11, which passes throughregistering openings formed in the lugs 12, projecting from theterminals of said sections, said pin having an eccentric or cam portion13, which engages with the medial lug, so as to draw the sections closetogether upon turning the pin after being placed in position A handle 14is fitted to one end of the pin for convenience of operation whenremoving and placing the pin in position and turning it in the lugs toeffect a drawing of the mold-sections together. Burners 15 are fitted tothe side pieces or sections of the moldbody and are connected byfiexible tubing with a suitable source of gas-supply, and these burn ersare provided with valves 16, by means of which the How of gas to theburners may be regulated or entirely cnt off.

The mold is provided with a series of cavities corresponding in shape tothe configuration of the article to be formed. A rabbet or seat 17surrounds the upper portion of each mold-cavity and is adapted toreceive apendent iange or rim 1S of the combined guide and cap plate 19.The lower edge of the rim or iiange 18 overhangs the mold-cavity andconstitutes, in effect, the top wall thereof. This cap-plate is providedwith oppositely disposed handles 20, by means of which it is placed inposition or removed from the mold, as required. Openings 21 are formedin the cap-plate in line with the mold-cavities and are adapted toreceive the plungers 22 and direct them in their vertical movements andmore particularly when advanced to expand the glass or plastic materialplaced in the mold-cavity and from which the article to be shaped isformed. The walls of the openings 21 are of sufficient extent to insurecentering and maintaining the plungers in proper position during theirforward movement when in active operation. These walls are reducedintermediate of their upper and lower ends to form spaces 23,surrounding the plu ngers, thereby reducing the extent of frictionalsurface between the parts. The size and shape of the openings 21 willdepend upon the eX- tent and form of the receiving ends of themold-cavities, as will be readily understood.

The plunger-head 24 has its lower end reduced, as shown at 25, and theshoulders formed at the base of the reduced end 25 incline oppositelyfrom a central point to admit of the cross-head 26 having alimitedrock-ing movement. The plunger-head 24 is adapted to have the forceapplied expanded for advancing the plungers, so as to compress and causethe plastic material to fill every portion of the mold-cavities.

The cross-head 26 is formed upon its top side with parallel ears 27,between which is received the reduced end 25 of the plungerhead, atransverse pivot-fastening 28 connecting the plunger-head and cross-headby being passed through registering openings formed in the parts 25 and27. The upper edges of the ears 27 are straight and come opposite theshoulders 29, formed at the base of the reduced end 25 and oppositelyinclined, as set forth. The lower end of the reduced part 25 is curvedlongitudinally, so as to admit of the cross-head rocking upon thepivot-fastening 28. The plungers 22 are looselyconnected with theterminal portions of the cross-head 26 by means of fastenings 30, whichare headed at their upper ends and have their lower ends threaded landfitted into openings formed centrally of the plu ngers. rlhe openings inthe ends of the cross-head are sufficiently large to admit of theplungers having a movement in every direction to adapt themselves to theguide-openings of the cap-plate 19 and to variations in the quantity ofmaterial placed in the mold-cavities. As shown, the plungers slope froma central point downwardly toward their sides, whereby provision is hadfor the relative movement between the plungers and cross-head. Afulcrum-pin 31 is located centrally of the cap-plate 19 and projectsvertically therefrom, and its upper end is made tapering and enters adepression or cavity formed centrally in the lower face of thecross-head 26. Inasmuch as the force applied to the plunger-head istransmitted to the plungers through the cross-head 26 and fulcrum-pin31, it is obvious that the said cross-head is adapted to turn or rockupon the fulcrum-pin, thereby equalizing the pressure applied to theplungers for forcing the material to all parts of the mold-cavities andresulting in subjecting said material in the mold-cavities to a likedegree of pressure, whereby perfect articles are formed.

The mold herein described is of the openand-shut type, and the articlesformed are provided with fins upon their outer surface corresponding tothe joints between the several sections of the mold. In the form of moldshown in Fig. 7 the sectional body forms the feet, knobs, or otherprojecting parts of the articles, the body portion of said articlesbeing formed in vthe block 32, which is removably fitted in a seatformed in the top side of the mold-body when the sections are united. Acap-plate 33 is in turn fitted within a seat formed in the upper side ofthe block and corresponds to the guide or cap plate 19 and is providedwith openings through which the plungers work. The articles shaped inthis form of mold are seamless, with the exception of the head and feet,which latter, being formed in the sectional body of the mold,

IOO

IIO

have seams corresponding with the joints be- 26 to tilt upon, alsocentralizes the parts 26 and 19, whereby the plungers 22 are properlypositioned when applying pressure thereto.

When the mold is used for pressing potteryvware, the heat resulting fromthe circulation of flame, hot air, or other medium dispels all moistureand prevents sweating and a sticking of the Ware in the mold whenformed.

Having thus described the invention, what is claimed as new isl. A moldhaving a plurality of mold-cavities, a vertically-disposed fulcrum-pinlocated about medially of the mold-cavities, a crosshead mounted uponthe upper end of the fulcrum-pin to tilt in any direction,plungersloosely connected with the cross-head and adapted to coperatewith the mold-cavities, and means for applying pressure to the crossheadin vertical line with the fulcrum-pin, substantially as set forth.

2. In combination with a mold having moldcavities, a cross-head mountedto rock, plungers located upon opposite sides of the fulcrum of the saidcross-head and having their top sides sloping from a central point inall directions, and a vertical pivotal connection between the cross-headand plungers,substan tially as set forth.

3. In combination with a mold having mold cavities, and a cap-plateapplied to the top side of the mold and formed with guide-openings,plungers adapted to work through the guide-openings of the cap-plate, across-head carrying the plungers and mounted upon a fulcrum-pin appliedto the cap-plate, and a plunger-head pivotally connected with thecross-head, substantially as set forth.

4. In combination, a mold having moldcavities, a cross-head bearingplungers and mounted to rock, and having spaced ears upon its top side,and a plunger-head having itsv lower portion reduced and pivotallyconnected between the said spaced ears and having the shoulders formedat the base of the reduced portion oppositely inclined, substantially asdescribed.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT R. GROTZ. [L s] Witnesses:

FRED HELLERY, JAMES WATERS.

